At the study start, 31 had the precancerous condition known as mild dysplasia and five had moderate dysplasia.
在研究开始前，31人有轻度不典型增生性癌前病变，5人有中度不典型增生性癌前病变。
Dysplasia and CIN are graded as mild, moderate, or severe.
不典型增生和CIN按轻微，适中的，或是严重来分级。
Dysplasia and CIN are graded as mild, moderate, or severe.
不典型增生和CIN按轻微，适中的，或是严重来分级。
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